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dawn_native: Use correct integer width for SetSubData. 

SetSubData's count is a uint64_t while Queue::WriteBuffer's is a size_t
so we add a small validation check that no narrowing will occur.

No test is added because SetSubData will be removed soon, and it will be
hard to test because of the Null backend's artificial OOM.

This was found while debugging an unrelated fuzzer issue.

Bug: chromium:1099621
Change-Id: I27a9da2b94f51e889c5573f88d4a0a73fea5985c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/23961
Reviewed-by: Stephen White <senorblanco@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This commit is contained in:
Corentin Wallez 2020-06-30 18:46:32 +00:00 committed by Commit Bot service account
parent 00d6215be9
commit f7fab5a259
2 changed files with 7 additions and 3 deletions
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8
src/dawn_native/Buffer.cpp
View File

@ -249,11 +249,15 @@ namespace dawn_native {
}
}
void BufferBase::SetSubData(uint32_t start, uint32_t count, const void* data) {
void BufferBase::SetSubData(uint64_t start, uint64_t count, const void* data) {
if (count > uint64_t(std::numeric_limits<size_t>::max())) {
GetDevice()->HandleError(InternalErrorType::Validation, "count too big");
}
Ref<QueueBase> queue = AcquireRef(GetDevice()->GetDefaultQueue());
GetDevice()->EmitDeprecationWarning(
"Buffer::SetSubData is deprecated, use Queue::WriteBuffer instead");
queue->WriteBuffer(this, start, data, count);
queue->WriteBuffer(this, start, data, static_cast<size_t>(count));
}
void BufferBase::MapReadAsync(WGPUBufferMapReadCallback callback, void* userdata) {

2
src/dawn_native/Buffer.h
View File

@ -58,7 +58,7 @@ namespace dawn_native {
MaybeError ValidateCanUseOnQueueNow() const;
// Dawn API
void SetSubData(uint32_t start, uint32_t count, const void* data);
void SetSubData(uint64_t start, uint64_t count, const void* data);
void MapReadAsync(WGPUBufferMapReadCallback callback, void* userdata);
void MapWriteAsync(WGPUBufferMapWriteCallback callback, void* userdata);
void* GetMappedRange();